A seperate rig for chicken is highly desirable. After trying several methods, cooking chicken hotter than you want anything else is the way I get the most consistent (both in quality and repeatable cooking time) results. Your uniflame will do nicely for this, you see lots of teams that cook their chicken indirect on small grills and cook their other 3 catagories on bigass fancy cookers of every variety.
If ya can swing it another WSM would give ya a bit more elbow room, like Phil, butts and briskets in the WSM's, chicken on your grill and ribs in the silver. Provided you like ribs in your silver this setup would be golden